Nitrous Question

skiwesser · 10-20-2006, 10:37 PM

With 60 shot runs great no sputter or anything, tried to go to 125 shot 42 psi fuel pressure and it came on STRONG but started sputtering at high rpm, not detonation or backfiring , but like pop,pop,pop, timing was at 11* went to 9* same thing, in fact i think it backfired through the top end (no damage), tried 90 shot same thing ??
I have a 190 lph pump, crane Hi-6 Ing. box, wet system with 1 nozzle at T.B.
Plugs looked ok def not rich, should I jack up the fuel presssure??

Help I'm supposed to go to strip on Sun.!!

skiwesser · 10-20-2006, 11:37 PM

Could my plugs be too hot?
I'm running autolite 3923's as per AFR's recommended starting point, I know nothing about heat ranges of plugs but these are long shank so autolite 24's I was running won't work.
I picked up some NGK - 8's?? dude said it was a pretty cold plug?
BTW I figure compression at 10-1, 10.25-1

bld racing · 10-20-2006, 11:50 PM

Sounds like to much plug gap. Try closing the gap by .005 to start and decrease by .005 till your miss goes away. Retart timing 2 degrees for every 50 hp.

skiwesser · 10-21-2006, 12:09 AM

Where should I start I think they are gapped to .032 now.

88workcar · 10-21-2006, 05:12 AM

I installed a remote fuel press guage, On the squirt you need to maintain 80psi.

Those headers seem a little large wesser?

bld racing · 10-21-2006, 11:03 PM

Try gapping your plugs at 30. Nitrous creates a lot of cylinder pressure so a good spark is a must. We had the same problem a long time ago and made it go away by closing up the plug gap. If 30 does not work go to 28. If your problem presists you may need to upgrade your ignition. Back when we were running mid 11's, with all stock modified parts we found that 30# injectors with stock fuel pressure seemed to work best. If you run a wet system you can add fuel through the fuel jet. Too much fuel will also create a miss.

10-20-2006, 10:37 PM	#1
skiwesser Registered Member Join Date: Sep 2000 Location: rock hill,S.C. 29730 Posts: 420	Nitrous Question With 60 shot runs great no sputter or anything, tried to go to 125 shot 42 psi fuel pressure and it came on STRONG but started sputtering at high rpm, not detonation or backfiring , but like pop,pop,pop, timing was at 11* went to 9* same thing, in fact i think it backfired through the top end (no damage), tried 90 shot same thing ?? I have a 190 lph pump, crane Hi-6 Ing. box, wet system with 1 nozzle at T.B. Plugs looked ok def not rich, should I jack up the fuel presssure?? Help I'm supposed to go to strip on Sun.!! __________________ 88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306. DYNO TUNED TO 300.97 RWHP 337RWTQ

10-20-2006, 11:37 PM	#2
skiwesser Registered Member Join Date: Sep 2000 Location: rock hill,S.C. 29730 Posts: 420	Re: Nitrous Question Could my plugs be too hot? I'm running autolite 3923's as per AFR's recommended starting point, I know nothing about heat ranges of plugs but these are long shank so autolite 24's I was running won't work. I picked up some NGK - 8's?? dude said it was a pretty cold plug? BTW I figure compression at 10-1, 10.25-1 __________________ 88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306. DYNO TUNED TO 300.97 RWHP 337RWTQ

10-20-2006, 11:50 PM	#3
bld racing fireball Join Date: Jan 2004 Location: Western Canada Posts: 6	Re: Nitrous Question Sounds like to much plug gap. Try closing the gap by .005 to start and decrease by .005 till your miss goes away. Retart timing 2 degrees for every 50 hp. __________________ 95 Mustang 8.89 @ 154.8 3200 lbs 302 on the juice

10-21-2006, 12:09 AM	#4
skiwesser Registered Member Join Date: Sep 2000 Location: rock hill,S.C. 29730 Posts: 420	Re: Nitrous Question Where should I start I think they are gapped to .032 now. __________________ 88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306. DYNO TUNED TO 300.97 RWHP 337RWTQ

10-21-2006, 05:12 AM	#5
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	Re: Nitrous Question I installed a remote fuel press guage, On the squirt you need to maintain 80psi. Those headers seem a little large wesser? __________________ 88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid I'm somewhere in tthe middle.

10-21-2006, 11:03 PM	#6
bld racing fireball Join Date: Jan 2004 Location: Western Canada Posts: 6	Re: Nitrous Question Try gapping your plugs at 30. Nitrous creates a lot of cylinder pressure so a good spark is a must. We had the same problem a long time ago and made it go away by closing up the plug gap. If 30 does not work go to 28. If your problem presists you may need to upgrade your ignition. Back when we were running mid 11's, with all stock modified parts we found that 30# injectors with stock fuel pressure seemed to work best. If you run a wet system you can add fuel through the fuel jet. Too much fuel will also create a miss. __________________ 95 Mustang 8.89 @ 154.8 3200 lbs 302 on the juice

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